linux-kernel - [PATCH] KVM: 'asm' operand has impossible constraints

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Message-Id: <200701260140.47760.caglar@pardus.org.tr>
Date:	Fri, 26 Jan 2007 01:40:44 +0200
From:	"S.Çağlar Onur" <caglar@...dus.org.tr>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	Avi Kivity <avi@...ranet.com>, kvm-devel@...ts.sourceforge.net
Subject: [PATCH] KVM: 'asm' operand has impossible constraints

Hi;

-rc6 fails with latest gcc 4.2 snapshot as following;

CC [M]  drivers/kvm/svm.o
drivers/kvm/svm.c:206: warning: 'inject_db' defined but not used
drivers/kvm/svm.c: In function 'svm_vcpu_run':
drivers/kvm/kvm.h:560: error: 'asm' operand has impossible constraints
make[2]: *** [drivers/kvm/svm.o] Error 1
make[1]: *** [drivers/kvm] Error 2
make: *** [drivers] Error 2

And according to this thread http://lkml.org/lkml/2006/11/11/129, solution is 
converting g to rm, patch follows

Signed-off-by: S.Çağlar Onur <caglar@...dus.org.tr>

Index: linux-2.6/drivers/kvm/kvm.h
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm.h	2007-01-26 01:38:35.000000000 +0200
+++ linux-2.6/drivers/kvm/kvm.h	2007-01-26 01:37:48.000000000 +0200
@@ -557,7 +557,7 @@
 #ifndef load_ldt
 static inline void load_ldt(u16 sel)
 {
-	asm ("lldt %0" : : "g"(sel));
+	asm ("lldt %0" : : "rm"(sel));
 }
 #endif


-- 
S.Çağlar Onur <caglar@...dus.org.tr>
http://cekirdek.pardus.org.tr/~caglar/

Linux is like living in a teepee. No Windows, no Gates and an Apache in house!

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